[R-sig-Geo] How to assess orientation of a topographic feature?

[Roland Pape]

Dear list,

is there any means to (automatically) assess the orientation of topographic features like a ridge or a valley based on a digital elevation model? To calculate the aspect (as direction of largest change) yields obviously not the wanted result, but what about using the direction of smallest change? Any help is greatly appreciated!

Kind regards,

Roland

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